USSR and the USA. Batman and Joker. Christoph Waltz and well, everyone. It's pretty tough to look at the world's best-known rivalries and exclude one of history's finest -- that being, of course, Sonic and Mario. The gritty battle between Nintendo and Sega gave fans on both sides plenty to converse about over the years, and one might say that the video game industry as a whole benefited from the back-and-forth. Now that Sega is a shell of its former self, though, the company's most iconic character is turning to its archrival in search of shelter. On the console side, Nintendo will be
